Winding Resistant Values; Meggering; Special Procedures Engine; Setting The Rpm - Whisper Power M-SC6 User Manual

TROUBLE SHOOTING
5.3.3

Winding resistant values

If after establishing and correcting any fault on the
capacitor and diodes output is still low when separately
excited, then the main rotor, stator and exciter stator
winding resistance should be checked as the fault must be
in one of these windings. The respective leads must be
disconnected before taking the readings.
Resistance values should be within 10% of the values
given in the table below:
M-SC6 and 8
Resistance
• Resistance both main stator windings
in series
• Resistance both rotor windings
• Resistance exciter stator winding
M-SC10
Resistance
• Resistance both main stator windings
in series
• Resistance both rotor windings
• Resistance exciter stator winding
5.3.4

Meggering

One can try to measure resistance between the housing
and the windings with a multimeter which should read
infinity. When readings are infinity but a fault is suspected
one can do a high voltage resistance test (MEGGERING)
This procedure should be carried out by an expert
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5.4
5.4.1
RPM is set by the manufacturer and should not need
readjustment! However a very slight offset after running in
could occur. RPM can be measured by a frequency meter.
M-SC8 and 10: When adjustments are necessary this can
only be done with the help of an interface to a computer
and special software to get access to the microprocessor.
If readjustment of the RPM is necessary, please contact
50Hz
your WhisperPower Service Centre for advice.
0.54 Ohm
M-SC6: Before readjustment check any other explanation
for the wrong speed. Engine speed is set at the factory at
0.93 Ohm
nominal 3000 (50 Hz) RPM. A RPM drop of 5% at full load
1.4 Ohm
is acceptable. Therefore a no load setting should be at ±
3150 RPM = 52.5 Hz. Under no circumstances should the
RPM be under full load below 2940 RPM = 49 Hz.
50Hz
0.36 Ohm
When no cause can be found for a wrong speed, the
1.05 Ohm
setting can be adjusted:
0.85 Ohm
1
Fig. 22
It is very important to identify the correct setting assembly
(refer to fig. 22).The screw is to be locked in position with
the lock-nut.

SPECIAL PROCEDURES ENGINE

Setting the RPM

2= adjustment screw RPM
3= manual stop
December 2010 / M-SC6/8/10 / EN
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